Mid-infrared quantum cascade lasers with high wall plug efficiency

Y. Bai, B. Gokden, S. Slivken, S. R. Darvish, S. A. Pour, M. Razeghi*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


We demonstrate optimization of continuous wave (cw) operation of 4.6 μm quantum cascade lasers (QCLs). A 19.7 μm by 5 mm, double channel processed device exhibits 33% cw WPE at 80 K. Room temperature cw WPE as high as 12.5% is obtained from a 10.6 μm by 4.8 mm device, epilayer-down bonded on a diamond submount. With the semi-insulating regrowth in a buried ridge geometry, 15% WPE is obtained with 2.8 W total output power in cw mode at room temperature. This accomplishment is achieved by systematically decreasing the parasitic voltage drop, reducing the waveguide loss and improving the thermal management.

Original languageEnglish (US)
Article number72220O
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2009
EventQuantum Sensing and Nanophotonic Devices VI - San Jose, CA, United States
Duration: Jan 25 2009Jan 28 2009


  • Mid infrared
  • Quantum cascade lasers
  • Wall plug efficiency

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Applied Mathematics
  • Electrical and Electronic Engineering
  • Computer Science Applications


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